[Interactive Effects of the Influencing Factors on the Changes of O3 Concentrations Based on GAMs Model in Chengdu]

To explore the influence characteristics of the interaction effects between meteorological factors on ozone(O₃) concentration in Chengdu, daily air pollutants and meteorological data from 2014 to 2019 were collected. Generalized additive models(GAMs) were adopted to explore the effects of different factors on O₃ concentration. The results showed that the relationship between O₃ and maximum temperature, sunshine hours, relative humidity, wind speed, precipitation, maximum mixed depth(MMD), and ventilation coefficient(VC) was non-linear. Specifically, the maximum temperature, sunshine hours, MMD, and relative humidity had a significant influence on O₃ concentration throughout the year. It is worth noting that the influence of relative humidity and precipitation on O₃ concentration during summer was more significant than that for the whole year. In the multi-meteorological factors GAMs of O₃ concentration, the meteorological factors mentioned above, except average wind, had significant impacts on O₃ concentration change. For the whole year, the judgment coefficient(R²) was 0.849 and the variance explanation rate was 85.1%. The maximum temperature was the most important influencing factor on O₃ concentration throughout the year. During summer, corresponding R² was 0.811 and the explanation rate of variance was 81.3%; however, maximum temperature and MMD were the dominant meteorological factors. In the interaction GAMs, for the whole year, the interaction between maximum temperature and sunshine hours, relative humidity, and precipitation, and the interaction between sunshine hours and MMD had a significant impact on O₃ concentrations. The interaction between maximum temperature and sunshine hours played a leading role in changes of O₃ concentration. The high temperature+strong radiation+MMD(about 2000 m) +no precipitation were conducive to the formation of O₃ concentration, but in summer, only the maximum temperature, sunshine hours, and VC had the most significant effect on the O₃ concentration, and strong high temperatures+strong radiation+the little horizontal wind in summer were conducive to the formation of O₃ concentration near the surface. In summary, GAMs model can not only be used to identify the dominant influencing factors of O₃ pollution, but also quantitatively analyze the influence of single effects and interaction of influencing factors on O₃ concentration, which has great significance for the prevention and control of O₃ pollution.

[A survey on knowledge of acupuncture disease spectrum and expectation of acupuncture treatment in Chengdu residents]

OBJECTIVE

To understand the knowledge of acupuncture disease spectrum, expectation of acupuncture treatment in Chengdu residents.

METHODS

A questionnaire regarding the knowledge of acupuncture disease spectrum and expectation of acupuncture treatment in Chengdu residents was established. By field sampling and internet survey, related data were collected and analyzed.

RESULTS

Totally 1 548 valid questionnaires were collected, including 1 041 from field survey and 507 from internet survey. The results indicated the knowledge of acupuncture and its disease spectrum were moderate in Chengdu residents; among the disease spectrum of acupuncture, the disease with the highest cognition was insomnia, accounting for 45.0% in field survey and 75.4% in internet survey; while the disease with the lowest cognition was infertility, accounting for 8.3% in field survey and 34.3% in internet survey.

CONCLUSIONS

The knowledge of acupuncture in Chengdu residents could be further improved, and the promotion of popular science of acupuncture should be strengthened in future.

[Epidemic situation of imported malaria in Chengdu City from 2012 to 2016]

Objective To understand the malaria epidemic situation in Chengdu City, so as to provide the evidence for effectively carrying out the malaria elimination work. Methods The data of imported malaria in Chengdu City from 2012 to 2016 were collected from the Disease Surveillance Information Reporting System of Chinese Center for Disease Control and Prevention and analyzed respectively. Results A total of 240 imported malaria cases were reported in Chengdu City from 2012 to 2016. In detail, 68.75% of the cases were falciparum malaria cases, 20.41% were vivax malaria cases, 2.50% were quartan malaria cases, 6.25% were ovale malaria cases, and 2.08% were mixed Plasmodium infections. Among them three patients died, with a mortality of 1.25%. All of the cases were infected overseas, among which 224 patients returned from Africa and 16 patients from Southeast Asia. The annual average morbidity was 0.28/100 000, and there was a significantly difference among annual average morbidities (χ² = 23.87, P < 0.001). There were malaria cases reported in every month, and no significantly difference among seasons (χ² = 0.833, P > 0.05). Conclusion The number of overseas imported malaria in Chengdu City increases year by year. The effective measures to control the overseas imported malaria should be strengthened to consolidate the achievements of malaria elimination.